lagom-java-chirper-example

Overview

A Lagom Java example showcasing a Twitter-like application

Local JVM

Start all services using mvn lagom:runAll or sbt runAll.

Minikube

Prerequisites

Build & Deploy

Install reactive-cli

See Tooling Documentation

Ensure you're using reactive-cli 0.8.0 or newer. You can check the version with rp version.

Start minikube

If you have an existing Minikube, you can delete your old one start fresh via minikube delete

minikube start --memory 6000

Setup Docker engine context to point to Minikube

eval $(minikube docker-env)

Enable Ingress Controller

minikube addons enable ingress

Install Reactive Sandbox

The reactive-sandbox includes development-grade installations of Cassandra, Elasticsearch, Kafka, and ZooKeeper. It's packaged as a Helm chart for easy installation into your Kubernetes cluster.

Note that if you have an external Cassanda cluster, you can skip this step. You'll need to change the cassandra_svc variable (defined below) if this is the case.

helm init
helm repo add lightbend-helm-charts https://lightbend.github.io/helm-charts
helm update

Verify that Helm is available (this takes a minute or two):

kubectl --namespace kube-system get deploy/tiller-deploy

NAME            DESIRED   CURRENT   UP-TO-DATE   AVAILABLE   AGE
tiller-deploy   1         1         1            1           3m

Install the sandbox. Since Chirper only uses Cassandra, we're disabling the other services but you can leave them enabled by omitting the set flag if you wish.

helm install lightbend-helm-charts/reactive-sandbox --name reactive-sandbox --set elasticsearch.enabled=false,kafka.enabled=false,zookeeper.enabled=false

Verify that it is available (this takes a minute or two):

kubectl get deploy/reactive-sandbox

NAME               DESIRED   CURRENT   UP-TO-DATE   AVAILABLE   AGE
reactive-sandbox   1         1         1            1           1m

Build Project

sbt clean docker:publishLocal

View Images

docker images

Deploy Projects

Finally, you're ready to deploy the services. Be sure to adjust the secret variables and cassanda service address as necessary.

# Be sure to change these secret values

chirp_secret="youmustchangeme"
friend_secret="youmustchangeme"
activity_stream_secret="youmustchangeme"
front_end_secret="youmustchangeme"

# Default address for reactive-sandbox, change if using external Cassandra

cassandra_svc="_cql._tcp.reactive-sandbox-cassandra.default.svc.cluster.local"

# deploy chirp-impl

rp generate-kubernetes-resources "lagom-java-chirper-tooling-example/chirp-impl:1.0.0-SNAPSHOT" \
  --env JAVA_OPTS="-Dplay.http.secret.key=$chirp_secret -Dplay.filters.hosts.allowed.0=$(minikube ip)" \
  --external-service "cas_native=$cassandra_svc" \
  --pod-controller-replicas 2 | kubectl apply -f -

# deploy friend-impl

rp generate-kubernetes-resources "lagom-java-chirper-tooling-example/friend-impl:1.0.0-SNAPSHOT" \
  --env JAVA_OPTS="-Dplay.http.secret.key=$friend_secret -Dplay.filters.hosts.allowed.0=$(minikube ip)" \
  --external-service "cas_native=$cassandra_svc" \
  --pod-controller-replicas 2 | kubectl apply -f -
  
# deploy activity-stream-impl

rp generate-kubernetes-resources "lagom-java-chirper-tooling-example/activity-stream-impl:1.0.0-SNAPSHOT" \
  --env JAVA_OPTS="-Dplay.http.secret.key=$activity_stream_secret -Dplay.filters.hosts.allowed.0=$(minikube ip)" | kubectl apply -f -
  
# deploy front-end

rp generate-kubernetes-resources "lagom-java-chirper-tooling-example/front-end:1.0.0-SNAPSHOT" \
  --env JAVA_OPTS="-Dplay.http.secret.key=$front_end_secret -Dplay.filters.hosts.allowed.0=$(minikube ip)" | kubectl apply -f -

View Results

See the resources created for you

kubectl get all

NAME                            DESIRED   CURRENT   UP-TO-DATE   AVAILABLE   AGE
deploy/activityservice-v1-5-0   1         1         1            1           2h
deploy/chirpservice-v1-5-0      3         3         3            3           2h
deploy/friendservice-v1-5-0     3         3         3            3           2h
deploy/front-end-v1-5-0         1         1         1            1           2h

NAME                                   DESIRED   CURRENT   READY     AGE
rs/activityservice-v1-5-0-659877cd49   1         1         1         2h
rs/chirpservice-v1-5-0-6548865dc5      3         3         3         2h
rs/friendservice-v1-5-0-66f688897b     3         3         3         2h
rs/front-end-v1-5-0-87c5b6b79          1         1         1         2h

NAME                            DESIRED   CURRENT   UP-TO-DATE   AVAILABLE   AGE
deploy/activityservice-v1-5-0   1         1         1            1           2h
deploy/chirpservice-v1-5-0      3         3         3            3           2h
deploy/friendservice-v1-5-0     3         3         3            3           2h
deploy/front-end-v1-5-0         1         1         1            1           2h

NAME                                   DESIRED   CURRENT   READY     AGE
rs/activityservice-v1-5-0-659877cd49   1         1         1         2h
rs/chirpservice-v1-5-0-6548865dc5      3         3         3         2h
rs/friendservice-v1-5-0-66f688897b     3         3         3         2h
rs/front-end-v1-5-0-87c5b6b79          1         1         1         2h

NAME                                         READY     STATUS    RESTARTS   AGE
po/activityservice-v1-5-0-659877cd49-59z4z   1/1       Running   0          2h
po/chirpservice-v1-5-0-6548865dc5-2fjn6      1/1       Running   0          2h
po/chirpservice-v1-5-0-6548865dc5-kgbbb      1/1       Running   0          2h
po/chirpservice-v1-5-0-6548865dc5-zcc6l      1/1       Running   0          2h
po/friendservice-v1-5-0-66f688897b-d22ph     1/1       Running   0          2h
po/friendservice-v1-5-0-66f688897b-fvndd     1/1       Running   0          2h
po/friendservice-v1-5-0-66f688897b-j9tzj     1/1       Running   0          2h
po/front-end-v1-5-0-87c5b6b79-mvnh8          1/1       Running   0          2h

NAME                  TYPE        CLUSTER-IP   EXTERNAL-IP   PORT(S)                         AGE
svc/activityservice   ClusterIP   None         <none>        10000/TCP,10001/TCP,10002/TCP   2h
svc/chirpservice      ClusterIP   None         <none>        10000/TCP,10001/TCP,10002/TCP   2h
svc/friendservice     ClusterIP   None         <none>        10000/TCP,10001/TCP,10002/TCP   2h
svc/front-end         ClusterIP   None         <none>        10000/TCP                       2h

Open the URL this command prints in the browser

echo "http://$(minikube ip)"

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